Shear-thinning cosmetic composition

ABSTRACT

The present invention relates to a shear-thinning or pseudoplastic cosmetic composition. Zeta potentials may be balanced such that a first ratio of the first zeta potential to the second zeta potential may be approximately 1:2. A second ratio of the first zeta potential to the third zeta potential may be approximately 1:2. And, a third ratio of the second zeta potential to the third zeta potential may be approximately 1:1. Balancing zeta potentials may ensure the shear-thinning cosmetic composition can dispense in its original viscous form and as a fine mist through a single device.

FIELD OF THE INVENTION

The present invention generally relates to a shear-thinning cosmeticcomposition, and more particularly, to a shear-thinning cosmeticcomposition having balanced zeta potentials.

BACKGROUND OF THE INVENTION

Compositions having a cream, gel, lotion, or an otherwise viscousconsistency can experience challenges dispensing in less viscous forms.Creating a shear-thinning composition, thixotripic in nature, with acontinuous phase or decrease in viscosity over time can be challenging.When dispensed under shear stress, conventional shear-thinningcompositions can slovenly dispense, such as, by spurting or creatingbuild-up around the nozzle or orifice. As such, conventional viscouscompositions lack the capability of achieving a continuous phasesufficient to dispense as a fine mist.

SUMMARY OF THE INVENTION

Embodiments of the present disclosure generally provide a cosmeticcomposition that may include a first active ingredient having a firstzeta potential, a second active ingredient having a second zetapotential, and a third active ingredient having a third zeta potential.A first ratio of the first zeta potential to the second zeta potentialmay be approximately 1:2. A second ratio of the first zeta potential tothe third zeta potential may be approximately 1:2. A third ratio of thesecond zeta potential to the third zeta potential may be approximately1:1. A combination of the first active ingredient, the second activeingredient, the third active ingredient, and other ingredients may bedelivered through a single device, in its original form, and as a finemist.

Embodiments of the present disclosure may provide a cosmetic compositionthat may include a first active ingredient having a first zetapotential, a second active ingredient having a second zeta potential,and a third active ingredient having a third zeta potential. A firstratio of the first zeta potential to the second zeta potential may beapproximately 1:2. A second ratio of the first zeta potential to thethird zeta potential may be approximately 1:2. A third ratio of thesecond zeta potential to the third zeta potential may be approximately1:1. A combination of the first active ingredient, the second activeingredient, the third active ingredient, and other ingredients may bedelivered through a single device having one or more nozzles under botha low shear and a high shear.

The foregoing summary is only intended to provide a brief introductionto selected features that are described in greater detail below in thedetailed description. Other technical features may be readily apparentto one skilled in the art from the following drawings, descriptions, andclaims. As such, this summary is not intended to identify, represent, orhighlight features believed to be key or essential to the claimedsubject matter. Furthermore, this summary is not intended to be used asan aid in determining the scope of the claimed subject matter.

BRIEF DESCRIPTION OF THE DRAWINGS

None

DETAILED DESCRIPTION OF THE INVENTION

To facilitate an understanding of this invention, several terms aredefined below. Terms defined herein have meanings as commonly understoodby a person of ordinary skill in the areas relevant to the presentinvention. Terms such as “a”, “an” and “the” are not intended to referto only a singular entity but include the general class of which aspecific example may be used for illustration. The terminology herein isused to describe specific embodiments of the invention, but their usagedoes not delimit the invention, except as outlined in the claims.

As used herein, a “cosmetic agent” or “cosmetic ingredient” or“ingredients” means agents or active ingredients suitable for topicalapplication on mammalian keratinous tissue. The cosmetic agent may be asubstance that aids in the cleansing or enhancement or protection of asubject's skin or the appearance (e.g., color, texture, look, feel,etc.) or odor of the subject's skin, body or hair. The cosmetic agentmay change the underlying structure of the skin or hair.

As used herein, the terms “prevent” and “preventing” include theprevention of the recurrence, spread, or onset of a skin or haircondition. It is not intended that the present invention be limited tocomplete prevention.

A “subject” refers to any mammal, preferably a human.

As used herein, the term “topical” refers to the administration of anagent or agents (e.g., cosmetic, vitamin, etc.) on the skin.

The term “zeta potential” refers to the zeta potential is the electricpotential at the plane of shear.

Except in operating and comparative examples, or where otherwiseexplicitly indicated, all numbers in this description indicating amountsor ratios of substrate or conditions of reaction, physical properties ofsubstrates, and/or use are to be understood as modified by the word“about”. All amounts are presented as percentages by weight of the finalcomposition unless otherwise specified.

The term “weight percent” may be denoted as “wt. %” herein.

All percentages, parts, and ratios are based upon the total weight ofthe compositions of the present invention unless otherwise specified.All such weights as they pertain to listed ingredients are based on theactive level, and therefore they do not include solvents or by-productsthat may be included in commercially available materials unlessotherwise specified.

The present disclosure generally provides a shear-thinning cosmeticcomposition capable of dispensing in its original form and as a finemist. Its original form may be a viscous composition, such as, a gel,lotion, cream, or another viscous composition. A fine mist may be aliquid that may provide particles less than approximately 1 micrometer(μm).

Form of Composition and Other Ingredients

Preferred compositions of the invention are a single aqueous phase anddo not contain oil or silicone. Compositions of the invention maytypically comprise from approximately 60% to 75% of water by weight ofthe total composition. This amount of water is that from all sources,such as that in Vinysol 2140L and Daitosol 5000AD. It should beappreciated that there may be more than 75% or less than 65% water byweight without departing from the present disclosure.

After the elimination of several potential ingredients, the followingmaterials were selected to balance the zeta potential of the cosmeticcomposition, as listed in Table 1 below.

Merquat™ 100 is a 39-44% aqueous solution of Polyquaternium-6 (a highlycharged cationic homopolymer of diallyl dimethyl ammonium chloride);available from Lubrizol Corporation.

Acrylates copolymer is commercially available, for example, as Daitosol™5000AD from Daito Kasei Kogyo Co. Daitosol 5000AD is a 50% aqueousmixture of acrylates copolymer. Daitosol 5000AD is reported to have a pHof 5.5-7.5, a viscosity of 50-100 mPa-s, a glass transition temperature(Tg) of about −14° C.

Polyglyceryl-2 isostearate is commercially available, for example, asRisorex™ PGIS21 from Kokyu Alcohol Kogyo Co., Ltd.

Water-soluble red algae extract is commercially available, for example,as Gelalg™ SPE from Knowde.

Lithium magnesium sodium silicate is commercially available, forexample, as Laponite-XLG XR™ from Eckart America.

It should be appreciated that the remaining ingredients may not providea zeta potential or may provide a negligible zeta potential ofapproximately zero. As such, the remaining ingredients do not impact thezeta potential of the cosmetic composition.

The combination of ingredients may provide more than one zeta potential.For example, a first active ingredient, such as Gelalg SPE, having afirst zeta potential. The first zeta potential may be equal toapproximately half of a second zeta potential of a second activeingredient, such as Laponite XLG XR. In other words, the ratio betweenthe first zeta potential and the second zeta potential may beapproximately 1:2. The first zeta potential may also equal approximatelyhalf of a third zeta potential of a third active ingredient, such aspolyquaternium-6. The first zeta potential may be approximately +24.34mV. The second zeta potential may be approximately +50.23 mV. The thirdzeta potential may be approximately +51.10 mV. In other words, the ratiobetween the first zeta potential and the third zeta potential may beapproximately 1:2. It should be appreciated that the first Zetapotential may be less than or greater than +24.34 mV without departingfrom the present disclosure. It should also be appreciated that thesecond zeta potential may be less than or greater than +50.23 mV withoutdeparting from the present disclosure. It should further be appreciatedthat the third zeta potential may be less than or greater than +24.34 mVwithout departing from the present disclosure. The zeta potential of thecosmetic composition may be between −40 and −50 mV.

The zeta potential of human skin is typically approximately −25 mV.Compositions having a zeta potential greater than −25 mV may best adhereto or provide the most efficacious application to users or human skin.The magnitude of the zeta potential indicates the degree ofelectrostatic repulsion or attraction between particles in a dispersion.A higher magnitude may indicate particles are more likely to remain insuspension and provide greater stability. Generally, a higher zetapotential may provide higher stability of a colloidal system. When ahigher surface charge opposes a charge of particles, a repulsion forcemay be greater than an attractive force. It should be appreciated that astable state between two atoms provides attraction to one another with aforce equivalent to the force to repel one another.

In some embodiments, the ratio of the zeta potential of the ingredientsmay range from about 1:1 to about 1:10, and most preferably, 13:1 toabout 15:1.

The composition zeta potential breaks down a viscosity of the cosmeticcomposition and the zeta potential ranges from about −5 millivolts toabout −90 millivolts, preferably about approximately −46 millivolts (mV)and more preferably about −10 to −70 millivolts (mV).

The combination of the first active ingredient, the second activeingredient, and the third active ingredient are delivered through one ormore nozzles of the single device at high shear and at a low shear,ranging from about 1 to 10 Newtons per square meter (N/m²) at roomtemperature of approximately 20 to 25 degrees Celsius. Viscosity in therange of approximately 100,000 cSt to approximately 500,000 cSt at ahigh shear of approximately 80 to 120 N/m² at approximately 20 to 25degrees Celsius. For example, a lotion may exhibit a low shear ofapproximately 1 to 10 N/m² and a mist may exhibit a high shear ofapproximately 80 to 120 N/m². Zeta Potential Measurement.

The combination of the first active ingredient, the second activeingredient, and the third active ingredient have a viscosity rangingfrom approximately 0 centistokes (cSt) to 15 million cSt, preferablyabout 0 centistokes (cSt) to 5 million cSt.

The zeta potential is a key indicator of the stability of colloidaldispersions, i.e. creams and lotions. The zeta potential measures themagnitude of the electrostatic or charge repulsion/attraction betweenparticles and is one of the fundamental parameters known to affect thestability of compositions. In other words, the zeta potential is theelectric potential at the plane of shear. Measuring the zeta potentialprovides insight into the causes of dispersion, aggregation, and/orflocculation, and may be applied to improve the formulation ofdispersions, emulsions and suspensions.

Generally, the zeta potential of human skin is typically approximately−25 mV. Compositions according to the present invention include a zetapotential greater than −25 mV. Such compositions having the zetapotential may best adhere to or provide the most efficacious applicationto users or human skin. The magnitude of the zeta potential indicatesthe degree of electrostatic repulsion or attraction between particles ina dispersion. A higher magnitude may indicate particles are more likelyto remain in suspension and provide greater stability. Generally, ahigher zeta potential may provide higher stability of a colloidalsystem. When a higher surface charge opposes a charge of particles, arepulsion force may be greater than an attractive force. It should beappreciated that a stable state between two atoms provides attraction toone another with a force equivalent to the force to repel one another.

The shear-thinning composition of the present invention may bepseudoplastic and may provide a non-Newtonian behavior of fluids. Itshould also be appreciated that the cosmetic composition may provide atopical formulation with film formers and/or inclusive or exclusivecolor or colorants without departing from the present disclosure. Itshould further be appreciated that the cosmetic composition may be asetting primer that may provide a sprayer to deliver a uniform coverageto the skin. It should be appreciated that the output of the spray maybe designed to deliver a fine mist to achieve optimum results. It shouldalso be appreciated that a shear-thinning cosmetic composition or apseudoplastic with high viscosity of the present disclosure may spray atany angle without departing from the present disclosure.

It should be appreciated that the remaining ingredients may not providea zeta potential or may provide a negligible zeta potential ofapproximately zero. As such, the remaining ingredients do not impact thezeta potential of the cosmetic composition.

Formulation

According to an aspect of the present invention, the formulationcomprising the cosmetic agent may be applied to mammalian keratinoustissue, to human skin, face or hair. The formulation comprising thecosmetic agents may be of various forms. For example, some non-limitingexamples of such forms include solutions, suspensions, lotions, creams,gels, emulsions, suspension, toners, ointments, cleansing agents,exfoliating agents, liquid shampoos and hair conditioners, pastes,foams, powders, mousses, shaving creams, hydrogels, film-formingproducts, facial and skin masks, and the like.

Exposure to ultraviolet light may result in excessive scaling andtexture changes of the stratum corneum. Therefore, the cosmetic agentsof the subject invention may optionally contain a sunscreen active. Asused herein, “sunscreen active” includes both sunscreen agents andphysical sunblock. Suitable sunscreen actives may be organic orinorganic.

Inorganic sunscreens useful herein include the following metallicoxides: titanium dioxide having an average primary particle size of fromabout 15 nm to about 100 nm, zinc oxide having an average primaryparticle size of from about 15 nm to about 150 nm, zirconium oxidehaving an average primary particle size of from about 15 nm to about 150nm, iron oxide having an average primary particle size of from about 15nm to about 500 nm, and mixtures thereof. When used herein, theinorganic sunscreens are present in the amount of from about 0.1% toabout 20%, preferably from about 0.5% to about 10%, more preferably fromabout 1% to about 5%, by weight of the cosmetic agent.

A wide variety of conventional organic sunscreen actives are suitablefor use herein. Sagarin, et al., at Chapter VIII, pages 189 et seq., ofCosmetics Science and Technology (1972), discloses numerous suitableactives. Specific suitable sunscreen actives include, for example:p-aminobenzoic acid, its salts and its derivatives (ethyl, isobutyl,glyceryl esters; p-dimethylaminobenzoic acid); anthranilates (i.e.,o-amino-benzoates; methyl, menthyl, phenyl, benzyl, phenylethyl,linalyl, terpinyl, and cyclohexenyl esters); salicylates (amyl, phenyl,octyl, benzyl, menthyl, glyceryl, and di-pro-pyleneglycol esters);cinnamic acid derivatives (menthyl and benzyl esters, a-phenylcinnamonitrile; butyl cinnamoyl pyruvate); dihydroxycinnamic acidderivatives (umbelliferone, methylumbelliferone,methylaceto-umbelliferone); trihydroxy-cinnamic acid derivatives(esculetin, methylesculetin, daphnetin, and the glucosides, esculin anddaphnin); hydrocarbons (diphenylbutadiene, stilbene); dibenzalacetoneand benzalacetophenone, naphtholsulfonates (sodium salts of2-naphthol-3,6-disulfonic and of 2-naphthol-6,8-disulfonic acids);di-hydroxynaphthoic acid and its salts; o- andp-hydroxybiphenyldisulfonates; coumarin derivatives (7-hydroxy,7-methyl, 3-phenyl); diazoles (2-acetyl-3-bromoindazole, phenylbenzoxazole, methyl naphthoxazole, various aryl benzothiazoles); quininesalts (bisulfate, sulfate, chloride, oleate, and tannate); quinolinederivatives (8-hydroxyquinoline salts, 2-phenylquinoline); hydroxy- ormethoxy-substituted benzophenones; uric and violuric acids; tannic acidand its derivatives (e.g., hexaethylether); (butyl carbotol) (6-propylpiperonyl) ether; hydroquinone; benzophenones (oxybenzene,sulisobenzone, dioxybenzone, benzoresorcinol,2,2,4,4-tetrahydroxybenzophenone,2,2-dihydroxy-4,4′-dimethoxybenzophenone, octabenzone;4-isopropyldibenzoylmethane; butylmethoxydibenzoylmethane; etocrylene;octocrylene; [3-(4′-methylbenzylidene boman-2-one), terephthalylidenedicamphor sulfonic acid and 4-isopropyl-di-benzoylmethane. Of these,2-ethylhexyl-p-methoxycinnamate (commercially available as PARSOL MCX),4,4-t-butyl methoxydibenzoyl-methane (commercially available as PARSOL1789), 2-hydroxy-4-methoxybenzophenone, octyldimethyl-p-aminobenzoicacid, digalloyltrioleate, 2,2-dihydroxy-4-methoxybenzophenone,ethyl-4-(bis(hydroxy-propyl))aminobenzoate,2-ethylhexyl-2-cyano-3,3-diphenylacrylate, 2-ethylhexyl-salicylate,glyceryl-p-aminobenzoate, 3,3,5-tri-methylcyclohexylsalicylate,methylanthranilate, p-dimethyl-aminobenzoic acid or aminobenzoate,2-ethylhexyl-p-dimethyl-amino-benzoate, 2-phenylbenzimidazole-5-sulfonicacid, 2-(p-dimethylaminophenyl)-5-sulfonicbenzoxazoic acid, octocryleneand mixtures of these compounds, are preferred.

More preferred organic sunscreen actives useful in the cosmetic agentsuseful in the subject invention are 2-ethylhexyl-p-methoxycinnamate,butylmethoxydibenzoyl-methane, 2-hydroxy-4-methoxybenzo-phenone,2-phenylbenzimidazole-5-sulfonic acid, octyldimethyl-p-aminobenzoicacid, octocrylene, and mixtures thereof.

Also, particularly useful in the cosmetic agents are sunscreen activessuch as those disclosed in U.S. Pat. No. 4,937,370 issued to Sabatellion Jun. 26, 1990, and U.S. Pat. No. 4,999,186 issued to Sabatelli &Spirnak on Mar. 12, 1991. The sun screening agents disclosed thereinhave, in a single particle, two distinct chromophore moieties whichexhibit different ultra-violet radiation absorption spectra. One of thechromophore moieties absorbs predominantly in the UVB radiation rangeand the other absorbs strongly in the UVA radiation range.

Preferred members of this class of sun screening agents are4-N,N-(2-ethylhexyl)methylaminobenzoic acid ester of2,4-dihydroxybenzophenone; N,N-di-(2-ethylhexyl)-4-aminobenzoic acidester with 4-hydroxydibenzoylmethane;4-N,N-(2-ethylhexyl)methylaminobenzoic acid ester with4-hydroxydibenzoylmethane; 4-N,N-(2-ethylhexyl)methylaminobenzoic acidester of 2-hydroxy-4-(2-hydroxyethoxy)benzophenone;4-N,N-(2-ethylhexyl)-methylaminobenzoic acid ester of4-(2-hydroxyethoxy)dibenzoylmethane;N,N-di-(2-ethylhexyl)-4-aminobenzoic acid ester of2-hydroxy-4-(2-hydroxyethoxy)benzophenone; andN,N-di-(2-ethylhexyl)-4-aminobenzoic acid ester of4-(2-hydroxyethoxy)dibenzoylmethane, and mixtures thereof.

Especially preferred sunscreen actives include4,4′-t-butylmethoxydibenzoylmethane, 2-ethylhexyl-p-methoxycinnamate,phenyl benzimidazole sulfonic acid, and octocrylene. A safe andeffective amount of the organic sunscreen active is used, typically fromabout 1% to about 20%, more typically from about 2% to about 10% byweight of the cosmetic agent. Exact amounts will vary depending upon thesunscreen or sunscreens chosen and the desired Sun Protection Factor(SPF).

In addition, the topical cosmetic agent may contain conventionalcosmetic adjuvants and additives such as preservatives, antioxidants,fatty substances, oils, water, organic solvents, silicones, thickeners,emollients, emulsifiers, sunscreens, defoamers, a surfactant, includinga cationic surfactant, a filler, a sequestering agent, an anionic, acationic, a nonionic or an amphoteric polymer or a mixture thereof, apropellant, an acidifying agent or a basic agent, a dye, acolorant/coloring agent, an abrasive, a skin sensate, an astringent, apigment or a nano pigment or a combustible pigment, such as for example,without limiting, iron oxides, metallic oxides or any other ingredienttypically formulated in cosmetic compositions. Such cosmetic ingredientswhich are suitable for use in the cosmetic composition of the presentinvention and which are conventionally used in the skin care industryare described in, for example, the CTFA Cosmetic Ingredient Handbook,Second Edition (1992), but are not limited thereto.

The cosmetic agents of the present invention, without limiting, may bepresent in form of lotions, milky lotions, creams and oil, oil inemulsions, watery substances, gels, hydrogels, shampoos, hair rinses,hair conditioners, hair creams, hair dyes, hair colors, pre- orpost-treatment agents for hair dyeing and coating agents for split hair,etc.

The formulation type of the cosmetic agents of the present invention maybe of any type, including solution system, soluble system, emulsionsystem, gel system, powder dispersing system or water-oil two phasesystem.

Conventional cosmetic adjuvants which may be suitable as additives are,for example, co-emulsifiers, fats and waxes, stabilizers, thickeners,biogenic agents, film formers, fragrances, dyes, pearlescent agents,preservatives, pigments, electrolytes (for example magnesium sulphate)and pH regulators. Co-emulsifiers are preferably known W/O and also O/Wemulsifiers such as polyglycerol esters, sorbitan esters or partiallyesterified glycerides. Typical examples of fats are glycerides; as waxeswhich may be mentioned in combination with hydrophilicized growing interalia beeswax, paraffin wax or microcrystalline waxes.

Metal salts of fatty acids such as magnesium, aluminum and/or zincstearate can be employed. Suitable thickeners are, for example,crosslinked polyacrylic acids and derivatives thereof, polysaccharides,more especially xanthan gum, guar-guar, agar-agar, alginate and tyloses,carboxymethylcellulose and hydroxy ethylcellulose, and also fattyalcohols, monoglycerides and fatty acids, polyacrylates, polyvinylalcohol and polyvinylpyrrolidone.

Biogenic active plant extracts, protein hydrolysates and vitamincomplexes, for example, to understand. Customary film formers are, forexample, hydrocolloids such as chitosan, microcrystalline chitosan orquaternized chitosan, polyvinylpyrrolidone, vinylpyrrolidone-vinylacetate copolymers, polymers of the acrylic acid series, quaternarycellulose derivatives and similar compounds.

Suitable preservatives are, for example, formaldehyde solution,p-hydroxybenzoate or sorbic acid. Pearlizing agents, for example, suchas ethylene glycol distearic esters come coldistearate, but also fattyacids and fatty acid into consideration.

The dyes suitable for cosmetic purposes, and authorized substances maybe used. Such dyes are normally used in concentrations of 0.001 to 0.1wt %, based on the total mixture. An additional content of antioxidantsis generally preferred. Thus, all suitable or customary for cosmeticand/or dermatological applications antioxidants can be used as favorableantioxidants.

The sunscreen compositions of the invention can accordingly be inliquid, paste or solid form, for example as a water-in-oil creams,oil-in-water creams and lotions, aerosol foam creams, gels, oils, greasepencils, dusting powders, sprays or hydroalcoholic lotions.

Use

Another aspect of the present invention is the use for cosmeticpurposes, including cosmetic uses such as, but not limited to,preventing and/or treating the signs of aging of the skin and protectingthe skin from UV rays.

Other uses also include preventing and/or treating impairment inluminosity, loss of radiance of the complexion, impairment of thesurface aspect of the skin, and/or impairment of the grain of the skinand/or for maintaining and/or improving the bio mechanical properties ofthe skin, and/or for stimulating the energy mechanism of fibroblasts,improve hair, improve texture of hair, improve skin radiance, protectthe skin from UV radiation, act as a sunscreen, treat skin'simpairments, fine lines, wrinkles, aging, or depuffing.

The composition according to the present invention may be delivered by adevice having one or more nozzles to facilitate shear. The device may bea single device and may also facilitate dispensation as a fine spray ora fine mist.

While particular embodiments of the present invention have beenillustrated and described, it would be obvious to those skilled in theart that various other changes and modifications may be made withoutdeparting from scope of the invention. It is therefore intended to coverin the appended claims all such changes and modifications that arewithin the scope of this invention.

EXAMPLES Example 1: Cosmetic Composition FORMULA I

Components Wt % Vinysol 2140L¹ 3.00 Merquat 100² 0.01 Phenoxetol 0.80Daitosol 5000AD³ 0.15 Risorex PGIS21⁴ 2.60 Propanediol 1.00 SD Alcohol3.00 Gelalg SPE⁵ 10.00 Citric Acid 0.05 Glycerine 2.00 Laponite XLG XR⁶3.50 Hyactive 10⁷ 0.30 Potassium Sorbate 0.25 KF-6100⁸ 0.10 Water Q.S.¹60% aqueous mixture of acrylates/VA copolymer/disodium EDTA²polyquaternium-6 ³50% aqueous mixture of acrylates copolymer⁴polyglyceryl-2 isostearate ⁵90% aqueous mixture of carrageenan ⁶lithiummagnesium sodium silicate ⁷sodium hyaluronate ⁸polyglyceryl-3 disiloxanedimethicone

Example 2: Cosmetic Composition FORMULA II

Components Wt % Vinysol 2140L¹ 3.00 Merquat 100² 0.01 Phenoxetol 0.80Daitosol 5000AD³ 0.15 Risorex PGIS21⁴ 2.60 Propanediol 1.00 SD Alcohol3.00 Gelalg SPE⁵ 12.00 Citric Acid 0.05 Glycerine 2.00 Laponite-XLG XR⁶4.50 Hyactive 10⁷ 0.30 Potassium Sorbate 0.25 KF-6100⁸ 0.10 Water Q.S.¹60% aqueous mixture of acrylates/VA copolymer/disodium EDTA²polyquaternium-6 ³50% aqueous mixture of acrylates copolymer⁴polyglyceryl-2 isostearate ⁵90% aqueous mixture of carrageenan ⁶lithiummagnesium sodium silicate ⁷sodium hyaluronate ⁸polyglyceryl-3 disiloxanedimethicone

Rheology Profile

The shear-thinning cosmetic composition may provide a rheology profilethat may provide a viscosity in the range of approximately 100,000centistokes (cSt) to approximately 500,000 cSt at a low shear ofapproximately 1 to 10 Newtons per square meter (N/m²) at roomtemperature of approximately 20 to 25 degrees Celsius. Viscosity in therange of approximately 100,000 cSt to approximately 500,000 cSt at ahigh shear of approximately 80 to 120 N/m² at approximately 20 to 25degrees Celsius. For example, a lotion may exhibit a low shear ofapproximately 1 to 10 N/m² and a mist may exhibit a high shear ofapproximately 80 to 120 N/m².

Zeta Potential Measurement Example 3: Electric Potential (Hereinafter,“Zeta Potential”)

The zeta potential is a key indicator of the stability of colloidaldispersions, i.e. creams and lotions. The zeta potential measures themagnitude of the electrostatic or charge repulsion/attraction betweenparticles and is one of the fundamental parameters known to affect thestability of compositions. In other words, the zeta potential is theelectric potential at the plane of shear. Measuring the zeta potentialprovides insight into the causes of dispersion, aggregation and/orflocculation, and may be applied to improve the formulation ofdispersions, emulsions, and suspensions.

The following example includes the zeta potential of each ingredient ofa shear-thinning cosmetic composition capable of dispensing both as afine mist and in its original form and is not intended to be limiting.It should be appreciated that the original form may include, but is notlimited to, a gel, cream, lotion, etc. It should be appreciated that afine mist may provide particles less than approximately 1 μm.

TABLE 1 Components Zeta Potential (mV) Vinysol 2140L * Merquat 100+51.10 Phenoxetol * Daitosol 5000AD −17.29 Risorex PGIS21 −61.09Propanediol * SD Alcohol * Gelalg SPE +24.34 Citric Acid * Glycerine *Laponite XLG XR +50.23 Hyactive 10 * Potassium Sorbate * KF-6100 *Water * Formula I −45.99 Formula II −45.99 * It should be appreciatedthat the zeta potential is minimal or negligible, thereby failing toimpact the zeta potential of Formulas I and II.

The combination of ingredients may provide a first active ingredient,such as Gelalg SPE, having a first zeta potential. The first zetapotential may be equal to approximately half of a second zeta potentialof a second active ingredient, such as Laponite XLG XR. In other words,the ratio between the first zeta potential and the second zeta potentialmay be approximately 1:2. The first zeta potential may also equalapproximately half of a third zeta potential of a third activeingredient, such as polyquaternium-6. The first zeta potential may beapproximately +24.34 mV. The second zeta potential may be approximately+50.23 mV. The third zeta potential may be approximately +51.10 mV. Inother words, the ratio between the first zeta potential and the thirdzeta potential may be approximately 1:2. It should be appreciated thatthe first Zeta potential may be less than or greater than +24.34 mVwithout departing from the present disclosure. It should also beappreciated that the second zeta potential may be less than or greaterthan +50.23 mV without departing from the present disclosure. It shouldfurther be appreciated that the third zeta potential may be less than orgreater than +24.34 mV without departing from the present disclosure.The zeta potential of the cosmetic composition may be between −40 and−50 mV.

Zeta Potential of Skin

The zeta potential of human skin is typically approximately −25 mV.Compositions having a zeta potential greater than −25 mV may best adhereto or provide the most efficacious application to users or human skin.The magnitude of the zeta potential indicates the degree ofelectrostatic repulsion or attraction between particles in a dispersion.A higher magnitude may indicate particles are more likely to remain insuspension and provide greater stability. Generally, a higher zetapotential may provide a higher stability of a colloidal system. When ahigher surface charge opposes a charge of particles, a repulsion forcemay be greater than an attractive force. It should be appreciated that astable state between two atoms provides attraction to one another with aforce equivalent to the force to repel one another.

The zeta potential of each active ingredient in Formulas I and II,described hereinabove, was measured using the procedure set forth below.

-   -   1. Approximately 49.8 grams of distilled water and approximately        0.2 grams of an active ingredient were placed in a two-ounce        container.    -   2. The container was covered with a lid and sonicated at room        temperature for approximately 30 minutes.    -   3. A capillary cell was inverted, and the sonicated sample was        slowly injected from its syringe into the capillary cell to fill        a U-tube slightly over approximately 50%.    -   4. Air bubbles were not formed in the cell.    -   5. The cell was turned upright and slowly continued injection        until the sample was placed at the top of the electrodes or gold        metal and monitored again to ensure no bubbles were in the cell.        When necessary, the cell was gently tapped to dislodge any        bubbles.    -   6. Both electrodes on the inside of the cell were completely        immersed in the sample.    -   7. A cell stopper was inserted into each port.    -   8. The cell was loaded into the instrument, and a triangle of        the cell was faced forward the front of the nano.    -   9. The cell was loaded or pushed into the holder until the cell        stopped.    -   10. The measurement chamber lid was closed to cover the cell.    -   11. The nano and the computer were powered on.    -   12. Measurements and testing were completed, in accordance with        standard operating procedure (SOP).

It should be appreciated that the particle size range may beapproximately 0.3 nanometers to approximately −10 micrometers. It shouldbe appreciated that the zeta potential may provide: excellent stabilityat greater than or equal to approximately 61 millivolts (mV); goodstability between approximately 40 and 60 mV; moderate stability betweenapproximately 30 and 40 mV; incipient stability between approximately 10and 30 mV; and rapid coagulation or flocculation between approximately 0to 5 mV.

It should be appreciated that the shear-thinning composition may bepseudoplastic and may provide a non-Newtonian behavior of fluids. Itshould also be appreciated that the cosmetic composition may provide atopical formulation with film formers and/or inclusive or exclusivecolor or colorants without departing from the present disclosure. Itshould further be appreciated that the cosmetic composition may be asetting primer that may provide a sprayer to deliver a uniform coverageto the skin. It should be appreciated that the output of the spray maybe designed to deliver a fine mist to achieve optimum results. It shouldalso be appreciated that a shear-thinning cosmetic composition or apseudoplastic with high viscosity of the present disclosure may spray atany angle without departing from the present disclosure.

Instead, unless otherwise specified, each such dimension is intended tomean both the recited value and a functionally equivalent rangesurrounding that value. For example, a dimension disclosed as “40 mm” isintended to mean “approximately 40 mm.”

It may be advantageous to set forth definitions of certain words andphrases used in this patent document. The terms “include” and“comprise,” as well as derivatives thereof, mean inclusion withoutlimitation. The term “or” is inclusive, meaning and/or. The phrases“associated with” and “associated therewith,” as well as derivativesthereof, may mean to include, be included within, interconnect with,contain, be contained within, connect to or with, couple to or with, becommunicable with, cooperate with, interleave, juxtapose, be proximateto, be bound to or with, have, have a property of, or the like.

While this disclosure has described certain embodiments and generallyassociated methods, alterations and permutations of these embodimentsand methods will be apparent to those skilled in the art. Accordingly,the above description of example embodiments does not define orconstrain this disclosure. Other changes, substitutions, and alterationsare also possible without departing from the spirit and scope of thisdisclosure, as defined by the following claims.

What is claimed is:
 1. A shear-thinning cosmetic composition comprisingcarrageenan, lithium magnesium sodium silicate, and polyquaternium-6;wherein the shear-thinning cosmetic composition provides a viscosity inthe range of approximately 100,000 centistokes (cSt) to approximately500,000 cSt at a low shear of approximately 1 to 10 N/m² at roomtemperature of approximately 20 to 25 degrees Celsius; and wherein theshear-thinning cosmetic composition exhibits a mist form at a high shearof approximately 80 to 120 N/m².
 2. The shear-thinning cosmeticcomposition of claim 1, wherein the shear-thinning cosmetic compositionis delivered through the single device via one or more nozzles.
 3. Theshear-thinning cosmetic composition of claim 1, wherein theshear-thinning cosmetic composition zeta potential is approximately −10to −70 millivolts (mV).
 4. The shear-thinning cosmetic composition ofclaim 1, wherein the ratio of the zeta potential of carrageenan to thezeta potential of lithium magnesium sodium silicate is approximately1:2, wherein the ratio of the zeta potential of carrageenan to the zetapotential of polyquaternium-6 is approximately 1:2, and wherein theratio of the zeta potential of lithium magnesium sodium silicate to thezeta potential of polyquaternium-6 is approximately 1:1.